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Liquid delivery pump

a liquid delivery pump and plunger seal technology, which is applied in the direction of positive displacement liquid engine, pump components, piston pumps, etc., can solve the problems of acceleration in the wear and deterioration etc., and achieve the suppression of the plunger seal wear and deterioration, the effect of reducing the liquid delivery accuracy and facilitating supply

Active Publication Date: 2019-03-12
SHIMADZU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively reduces wear and deterioration of the plunger seal, maintaining accurate liquid delivery by improving slidability and preventing deformation, thus ensuring consistent pump performance.

Problems solved by technology

If the slidability between the outer circumferential surface of the plunger and the inner circumferential surface of the plunger seal is reduced, the plunger seal is worn out, and there are problems of liquid leakage due to seal failure on the outer circumferential surface of the plunger, and acceleration in the deterioration of the plunger seal due to frictional heat.

Method used

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  • Liquid delivery pump
  • Liquid delivery pump

Examples

Experimental program
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Embodiment Construction

[0022]As a preferred embodiment of a liquid delivery pump according to the present invention, one may be cited that is provided with a recessed section about the same size or larger than a plunger passage hole and serving as a liquid passage element at a center portion of a surface, of a backup ring, on a pump body side, the recessed section being provided with a through hole at its center. According to such a structure, cleaning liquid flowing out of a cleaning space is stored at a position close to a plunger seal, and the cleaning liquid may be easily supplied to the plunger seal.

[0023]Also, a groove where the cleaning liquid from the cleaning space is to pass through may be provided, as a liquid passage element, on the inner circumferential surface of the through hole of the backup ring. According to such a structure, it is possible to supply the cleaning liquid to the plunger seal while preventing the plunger seal from entering the through hole of the backup ring.

[0024]Further, ...

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PUM

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Abstract

A plunger seal is mounted on the pump head, has a through hole for allowing penetration of the plunger, and holds the outer circumferential surface of the plunger and also seals an opening of the pump chamber. A backup ring is mounted on the pump head by being interposed between the plunger seal and the tip end surface of the pump body. The backup ring has a through hole, for allowing penetration of the plunger, formed in a manner not allowing the plunger seal to enter a gap to the outer circumferential surface of the plunger, and also has a liquid passage element for allowing the cleaning liquid in the cleaning space to reach the plunger seal through the through hole.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a plunger-type liquid delivery pump for delivering liquid by sliding the tip end of a plunger inside a pump chamber provided in a pump head and repeating suction of liquid from a suction port and discharge of the liquid from a discharge port.[0003]2. Description of the Related Art[0004]A plunger-type liquid delivery pump slides a tip end portion of a plunger inside a pump chamber by mounting a pump head including the pump chamber inside to a tip end portion of a pump body and by causing a crosshead holding a base end of the plunger to reciprocate in the axial direction of the plunger inside the pump body.[0005]The pump head is provided with an inlet channel for allowing liquid to flow into the pump chamber and an outlet channel for allowing the liquid to flow out of the pump chamber, A check valve is provided to each of the inlet channel and the outlet channel. According to such a struct...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F04B53/04F04B53/02F04B53/00F04B53/16F04B53/14F04B9/02
CPCF04B53/162F04B53/007F04B53/146F04B53/164F04B53/02F04B9/02
Inventor IMAMURA, SHINYA
Owner SHIMADZU CORP
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